Studies on the Flower-bud Differentiation and Development in 12 Species of Flowering Trees and Shrubs in Hirosaki

Abstract

Using scanning electron microscopy flower-bud differentiation and development in flowering trees and shrubs found in Hirosaki, Aomori Prefecture, were examined in 1986 and 1987.
From the results, it was found flower-bud initiation in Coiylopsis paucitlora, Daphne odora, Conies officinalis, Rhododendron Kaempferi, and Forsythia viridissiina occur before mid-July. On the other hand, in Prunes vedoensis, Prunus japonica, Prunes inuine, Prunes persica, Males Halliana, and Rhododendron indicum, flower-buds differentiate in mid-July to late August, the hottest period of the year. Differentiation in Spiraea Thunbergii occurs in September.